What are the different types of insulating oil?

Different types of insulating oils include:
Mineral oil: The most common type used in transformers, known for its good insulating properties and thermal stability.
Silicone oil: Used in high-temperature environments due to its excellent thermal stability.
Natural ester (e.g., FR3): Biodegradable and environmentally friendly, offering fire-resistant properties.
Synthetic ester: Offers similar benefits to natural ester but with enhanced performance under extreme conditions.
PCB oil: Previously used for its insulating properties but now banned due to environmental and health concerns.